drilling mudna mixture of clays, water, and chemicals pumped down the drill string while an oil well is being drilled to lubricate the mechanism, carry away rock cuttings, and maintain pressure so that oil or gas does not escape

mud bathn

1a medicinal bath in heated mud

2a dirty or muddy occasion, state, etc.

mud daubernany of various wasps of the family Sphecidae, that construct cells of mud or clay in which they lay their eggs and store live insects as food for the developing larvaeSee also→
digger wasp

mud flatna tract of low muddy land, esp. near an estuary, that is covered at high tide and exposed at low tide

mud hennany of various birds that frequent marshes or similar places, esp. the coots, rails, etc.

mud mapn(Austral)informala map drawn on the ground with a stick, or any other roughly drawn map